A good concept gameplay-wise, although there are some parts that feel a bit unfair. For instance, in level 4, the platforms appear only for 1 second while the enemy walks over the button. That's reaaally short. Pressing space while on a button with the mudblock also does not instantiate a block, it might be a collider issue. I thought it was kinda funny the enemies were spheres :)
The text for the UI can also feel a bit cluttered at times, consider having a panel, or some kind of textbox (you can also look for different fonts, as avoiding the default one can really help you stand out).
So overall seems like you had a lot of good ideas design-wise, but the way it's executed could use some polish and playtesting to make sure everything flows smoothly. Still, submitting a finished game on this jam is no small feat, congrats :)